Small Slewing Ring

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Small slewing bearing or slew[ing] ring is a rotational rolling-element bearing  that typically supports a heavy but slow-turning or slow-oscillating load, often a horizontal platform such as a conventional crane ,a swing yarder,or the wind-facing platform of a horizontal-axis  windmill. (To "slew" means to turn without change of place.)

Compared to other rolling-element bearings, slewing bearings are thin in section and are often made in diameters of a metre or more; the slewing bearings on the Falkirk Wheel  are 4 metres diameter and fit over a 3.5 metre axle.

Slewing bearings often use two rows of rolling elements. They often use three race  elements, such as an inner ring and two outer ring "halves" that clamp together axially.

Slewing bearings are often made with gear teeth integral with the inner or outer race, used to drive the platform relative to the base.

As for other bearings that reciprocate, rather than rotating continuously, lubrication can be difficult. The  oil wedge built up in a continuously rotating bearing is disrupted by the stop start motion of slewing. Instead, a  hydrostatic bearing with pumped oil flow may be used.

E320B excavator slewing ring slewing circle slewing bearing

311.15 mm 213.519 mm
254 mm 63.5 mm


2600 rpm 85.000 mm
49.20 mm 3600 rpm

High precision excavator slewing bearing KH180-3,9099074

160.0000 mm 2.00 mm
1.00 mm 4500 rpm

231D excavator slewing ring bearing for hot-selling models with P/N:8R6205

120 mm 3 mm
1.14 1080 kN

KH125-3 slewing bearing slewing ring slewing circle for crawler crane and drill

40000 N 70.000 mm
7000 rpm 6000 rpm

RB30035USP Precise Crossed Roller Bearing For Robotics&Mechanized equipment

55.000 mm 1.50 mm
66000 N No Shield, no Seal

slewing ring I.500.22.00.A Slewing Bearing without Teeth

0.3 mm 20 mm
9 ° Regular relubricatio

Crossed Tapered Roller Bearing BFKB353212/ HA4

132 mm 162 mm
490 kN 100 N/mm²

CRBS 1108 V UU with high performance Crossed Roller Bearing For Industrial Robot

11.0000 in 204000 N
2100 rpm 8.250 in